Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
The Book of Enoch (いのち) has passed down your fate and told you how to use your life. You must read the book of Enoch and find out what you're supposed to do.
We all owe our lives to Koichi.
Please, please value your life more than learning kanji on WaniKani.
Sailor Moon’s life is in danger!